You know, this would be really evil, and it goes against everything I believe in, but couldn't a person (with no compassion at all) just remove the rock containing the mantis, and fill the hole with crazy glue, effectively encasing the stomatopod, wait a few minutes for it to dry, and throw it back in? Apparently they can dig through rock so simply sealing the door wouldn't help. You'd need to immobilize him. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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